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A kind of cobalt-based synthetic catalyst and its preparation method and application

A technology for synthesis of catalysts and tropes, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, etc., can solve the problems of reduced content of effective active metal cobalt, reduced pore volume, and no activity, etc., to increase Effects of dispersion and reduction, improvement of dispersion and reduction, activity and stability

Active Publication Date: 2017-12-19
中科潞安能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under certain reaction conditions, the metal cobalt and the alumina support will interact to form cobalt aluminate that is not easily reduced and has no activity, which will lead to a decrease in the specific surface area of ​​the catalyst, a decrease in the pore volume, and a smaller pore channel. The cobalt content is reduced, and directly leads to the reduction of Fischer-Tropsch reaction activity and stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] According to the molar ratio of aluminate to alumina in the modified alumina, weigh a certain amount of Cu(NO 3 ) 2 ·3H 2 O, Al(NO 3 ) 3 9H 2 O and citric acid were dissolved in distilled water, and the mixed solution was stirred and evaporated to a certain volume in a 60°C water bath, and then the equal volume was impregnated in a certain amount of alumina (Shandong Aluminum, activated alumina, with a specific surface area of ​​300m 2 g -1 , pore volume 0.4cm 3 g -1 , average pore size 10nm), where Cu 2+ :Al 3+ : Citric acid: Al 2 o 3 =1:2:1.5:20 (mol / mol) to obtain the carrier precursor; after drying the carrier precursor at 110°C for 12h, transfer it to a muffle furnace, and roast it at 750°C for 4h to obtain modified alumina CuAl 2 o 4 -Al 2 o 3 ;Press Co 3 o 4 Accounting for 30(wt.)% of the final catalyst, weigh Co(NO 3 ) 2 ·6H 2 O, prepare a solution, impregnate the above-mentioned modified alumina with equal volume, dry at 100°C for 8h, transfe...

Embodiment 2

[0021] According to the molar ratio of aluminate to alumina in the modified alumina, weigh a certain amount of Zn(NO 3 ) 2 ·6H 2 O, Al 2 ·(SO 4 ) 3 18H 2 O and tartaric acid were dissolved in distilled water, and the mixed solution was stirred and evaporated to a certain volume in a 70°C water bath, and the equal volume was impregnated in a certain amount of alumina (self-made activated alumina, co-precipitation of 1mol / L aluminum nitrate and 1mol / L ammonia water, Precipitation temperature 50°C, aging temperature 70°C, aging time 2h, drying at 110°C for 12h, calcination at 600°C for 4h, the specific surface area is 270m 2 g -1 , pore volume 0.7cm 3 g -1 , average pore size 14nm), where Zn 2+ :Al 3+ : Tartaric acid: Al 2 o 3 =1:2:0.8:15 (mol / mol) to obtain the carrier precursor; after drying the carrier precursor at 150°C for 10h, transfer it to a muffle furnace, and roast it at 650°C for 6h to obtain modified alumina ZnAl 2 o 4 -Al 2 o 3 . Press Co 3 o 4 Acc...

Embodiment 3

[0024] According to the molar ratio of aluminate to alumina in the modified alumina, weigh a certain amount of Ni(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and malic acid were dissolved in distilled water, and the mixed solution was stirred and evaporated to a certain volume in a water bath at 80°C, and then an equal volume was impregnated in a certain amount of alumina (Sasol Company, activated alumina, with a specific surface area of ​​500m 2 g -1 , pore volume 1.1cm 3 g -1 , average pore size 6nm), where Ni 2+ :Al 3+ : Malic acid: Al 2 o 3 =1:2:0.5:5(mol / mol) to obtain the carrier precursor; after drying the carrier precursor at 80°C for 24h, transfer it to a muffle furnace, and roast it at 700°C for 10h to obtain modified alumina NiAl 2 o 4 -Al 2 o 3 . Press Co 3 o 4 Accounting for 18 (wt.)% of the final catalyst, weigh C 4 h 6 o 4 ·Co·4H 2 O, prepare a solution, impregnate the above-mentioned modified alumina with equal volume, dry at 120°C for 2h, transfe...

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Abstract

A cobalt-based synthesis catalyst and its preparation method and application. A cobalt-based Fischer-Tropsch synthesis catalyst is characterized in that the catalyst is composed of tricobalt tetroxide and aluminate modified alumina, wherein tricobalt tetroxide accounts for 15%-45% by weight of the final catalyst, and the aluminate and aluminate in the modified alumina are composed of 15%-45%. The molar ratio of alumina is 1:5‑20. Compared with the prior art, the present invention can increase the effective load of cobalt, improve the degree of dispersion and reduction of cobalt, and improve the activity and stability of Fischer-Tropsch synthesis reaction.

Description

technical field [0001] The invention relates to a cobalt-based synthesis catalyst as well as its preparation method and application. Background technique [0002] Cobalt-based Fischer-Tropsch synthesis catalysts are usually prepared by the impregnation method. The specific surface area, acidity and alkalinity, pore structure, strength, and the interaction between the support and the metal are all important factors affecting the activity and stability of the catalyst. SiO 2 、Al 2 o 3 、TiO 2 , Molecular sieve and activated carbon can be used as the carrier of cobalt-based Fischer-Tropsch synthesis catalyst. Among them, Al 2 o 3 With larger pores and higher specific surface area, it can effectively solve the diffusion of heavy components in the Fischer-Tropsch reaction product in the pores of the catalyst, and can effectively prevent the problem of catalyst activity reduction or deactivation caused by carbon deposition. In addition, Al 2 o 3 It has high temperature res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J23/80C10G2/00
Inventor 李德宝侯博贾丽涛刘岩张国权刘亚纯
Owner 中科潞安能源技术有限公司
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